Prentice Hall Biology Unit 1 Chapter 2

Front 1

Basic unit of matter.

Back 1

Atom

Front 2

The center of the atom which contains the protons and neutrons; in cells, structure that contains the cells genetic material (DNA) and controls the cell's activities.

Back 2

Nucleus

Front 3

Negatively charged particle; located outside the atomic nucleus.

Back 3

Electron

Front 4

Substance consisting entirely of one type of atom.

Back 4

Element

Front 5

Atom of an element that has a number of nuetrons different from that of other atoms of the same element.

Back 5

Isotope

Front 6

Substance formed by the chemical combination of two or more elements in definite proportions.

Back 6

Compound

Front 7

Bond formed when one or more electrons are transferred from one atom to another.

Back 7

Ionic Bond

Front 8

Atom that has a positive or negative charge.

Back 8

Ion

Front 9

Bond formed by the sharing of electrons.

Back 9

Covalent Bond

Front 10

Smallest unit of most compounds.

Back 10

Molecule

Front 11

A slight attraction that develos between the oppositely charged regions of nearby molecules.

Back 11

Van Der Waals Forces

Front 12

Attraction between molecules of the same substance.

Back 12

Cohesion

Front 13

Attraction between molecules of different substances; in plants, attraction between unlike molecules.

Back 13

Adhesion

Front 14

Material composed of two or more elements or compounds that are physically mixed together but not chemically combined.

Back 14

Mixture

Front 15

Mixture of two or more substances in which the molecules of the substanes are evenly distributes.

Back 15

Solution

Front 16

Substance that is dissolved in a solvent to make a solution.

Back 16

Solute

Front 17

Substance in which a solute is dissolved to form a solution.

Back 17

Solvent

Front 18

Mixture of water and nondissolved materials.

Back 18

Suspension

Front 19

Measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0 to 14.

Back 19

pH Scale

Front 20

Compound that forms hydrogen ions (H+) in solution.

Back 20

Acid